Smoke and Ventilation Issues

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Smoke and Ventilation Issues

• Nancy B. McAtee
• Office of Research and Engineering

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Smoke and Ventilation

• Overview of ventilation system
• Timeline
• Safety issues

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Ventilation Operations

• Normal ventilation
• Emergency ventilation
• Vent shaft fans
• Station/platform fans
• Fans controlled from control center or locally

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Ventilation Operations

• CTA confirms incident location before activating
  fans
• Fan 108 removed but not replaced

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Ventilation Operations

• Initial response
• All fans in exhaust
• Fan 133
• Clark/Lake
• Continuous platform
• Revised response
• Reversible fans switched to supply
• Fans Clark/Lake
• Continuous platform

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Issues

• Not all CTA fans reversible
• Fan 133 - exhaust only
• Worked against station fans
• Drew smoke in direction of evacuation
• One fan missing
• Fan 108 not present at time of accident
• If present, smoke in area of accident removed
  more efficiently

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